Improvement in blackboards



UNrTED STATEs PATENT OFFICEo FRANK G. HUNT, OF BUFFALO, NEYV YORK.

IMPROVEMENT IN BLACKBOARDS.

.Specification forming part of Letters Patent No. 147,267, datedFebruary 10, 1874 3 application filed April 9, 1873.

To all whom fit may concern:

Beit known that I, FRANK GARDNER HUNT, of Buffalo, in the county of Erieand State of New York, have made new and useful Improvements inBlackboards, of which the following is a specification:

This invention relates to boards with slate or colored surfaces for theuse of schools, academies, 83e.; and the invention consists in providinga series of blackboards sliding up and down in a vertical frame withsuitable grooves therefor. v

In the drawings, Figure l is a front elevation. Fig. 2 is a sectionalperspective view.

A A represent the two uprights of the frame; B, the top piece; and G C',the feet on which the whole stands, and in which casters are set to moveor turn the frame around. The insides of the uprights A A are providedwith grooves, or their equivalents, in which slide vertically a seriesof boards, a a a, with slate or dark-colored surfaces for chalkingnumbers, examples, musical illustrations, &c., as is common in schoolsand similar places. The upper board, I), as in the drawings, is leftwhite, or it will have a light-tinted surface for the better use ofcharcoal, crayons, &c., for illustrations in drawing, &e. One or more ofthe boards can be so left, if desired. The outer edges of the frames ofthese boards will be provided with rollers or knobs set at properdistances apart to slide in the grooves of the uprights A A', to keepthe frames and grooves from binding in case of the wood warping. Thenthe boards are all down side by side in the frame, to keep them frombeing rubbed, and from dust, I provide a protecting piece,

I), one on each side of the frame A, and fastened thereto, as shown inFig. l., or it may swing open. To raise the boards, I attach a ring oreye, e e, to the top of each, and by means of a hook, d, on the end of acord, c, which passes through the center of the top piece B, and overpulleys ff, each board .is raised as high as wanted, and held there bymeans of pins or their equivalents, g g, set in the outside of the frameA. The cord is fastened onto the pin by means of an eye or ring, h, asshown. An ornamental piece or design, E, will be arranged on top of thepiece B, as Shown, or of any desired form.

The front of the protecting piece D may also be ornamentcd, (see Fig.1,) or have the name of the school or institution on it, making ahandsome addition to the frame, if desired.

I am acquainted with folding and swinging blackboards, but never haveseen duplicate boards, or a series of boards, sliding in an uprightframe, or possessing the advantages of economy of space and comparativecheapness of construction which mine unites.

I claim- 'lhe portable frame A B, provided with the series ofvertically-sliding' blackboards a a., when constructed and arrangedsubstantially as and for the purpose specified.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

E. e. HUNT.

Witnesses J. R. DRAKE, C. D. SWAN.

